Handle to the window - C / C++ / MFC Discussion Boards

moredip3-Jun-02 6:20

3-Jun-02 6:20

OK, I'm tearing my hair out over this one...

I've got a project with 2 .cpp files, both of which #include a .h file. All is well in the world. I add a second .h file (4dlist.h), for a template class. All is still well in the world. I then add a new .cpp file, with the single line #include "4DList.h", and now I start getting wierd compile errors.

So to recap, I have the following files:

CenFilter.cpp
CenWriter.cpp
foo.cpp
CenFilter.h
4DList.h

when foo is empty, everything works. when #includes 4DList.h I get errors.

here is the start of 4dlist.h:

template <class TYPE> class C4DList  
{
public:
	C4DList( UINT MaxSize = 1000 );
	virtual ~C4DList();
	C4DList( const C4DList &Copy );
	void operator=( const C4DList &op2 );

	UINT GetSize(){return m_ListSize;}

	void AddTail( TYPE *pData );
	TYPE *GetAt( UINT index );
	void RemoveAt( UINT index );
	void RemoveCurrentIt();//remove at the previous iterator value;
	void RemoveAll();
	void DeleteAllData();

	void ItStart();
	TYPE *ItNext();
...
...
...

So CenFilter.h has #include 4dlist.h and is fine.

but if foo.cpp has the single line it throws up:

Compiling...
foo.cpp
C:\Pete\Capture\CenFilter\CenReadFilter\4dlist.h(12) : error C2629: unexpected 'class C4DList<type> ('
C:\Pete\Capture\CenFilter\CenReadFilter\4dlist.h(51) : see reference to class template instantiation 'C4DList<type>' being compiled
C:\Pete\Capture\CenFilter\CenReadFilter\4dlist.h(12) : error C2238: unexpected token(s) preceding ';'
C:\Pete\Capture\CenFilter\CenReadFilter\4dlist.h(51) : see reference to class template instantiation 'C4DList<type>' being compiled
C:\Pete\Capture\CenFilter\CenReadFilter\4dlist.h(17) : error C2146: syntax error : missing ';' before identifier 'GetSize'
...
...

Now I REALLY don't get this. Oh, BTW, this isn't a standard appwizard project, it's adapted from an MSDN sample project.

I hope someone can help!

Pete

Re: Strange compilation errors

moredip3-Jun-02 6:29

moredip

3-Jun-02 6:29

oops, I forgot about the <> thing Blush | :O

the first line of that code snippet should've been

template < class TYPE > class C4DList

sorry!

Re: Strange compilation errors

Joaquín M López Muñoz3-Jun-02 6:29

Joaquín M López Muñoz

3-Jun-02 6:29

Not sure if this is your problem, but you have to include <windows.h> for UINT and other such types to be defined.

Joaquín M López Muñoz
Telefónica, Investigación y Desarrollo

Re: Strange compilation errors

moredip3-Jun-02 6:34

moredip

3-Jun-02 6:34

I don't think that's it, coz my other .cpp and .h files have UINT's in them

Thanks anyway

Re: Strange compilation errors

Joaquín M López Muñoz3-Jun-02 6:35

Joaquín M López Muñoz

3-Jun-02 6:35

Give it a try, it's safer than guessing.

Joaquín M López Muñoz
Telefónica, Investigación y Desarrollo

Re: Strange compilation errors

moredip3-Jun-02 6:44

moredip

3-Jun-02 6:44

OK, I think that was the best advice I've had in a few months Smile | :)

Next time I won't make any dumb assumptions. Or rather, I'll try not too.

I guess that the other .cpp files were including something else which eventually included windows.h

Thanks a lot Joaquin, I was starting to lose hope back there Big Grin | :-D

Pete

Re: Strange compilation errors

Joaquín M López Muñoz3-Jun-02 6:47

Joaquín M López Muñoz

3-Jun-02 6:47

I'd say 90% of debugging nightmares stem from false assumptions like "it can't be that because I know it works" and things like that. Happy programming Smile | :)

Joaquín M López Muñoz
Telefónica, Investigación y Desarrollo

Handle to the window

Mazdak3-Jun-02 5:36

Mazdak

3-Jun-02 5:36

I want when I run my program ,I get the handle of window opened behind it,I use this code but it does not work,Can anybody tell me whats the problem with this:

hwnd = ::GetForegroundWindow();
hwnd = ::GetNextWindow( hwnd , GW_HWNDNEXT );
::SetForegroundWindow(hwnd);

Mazy

"The more I search, the more my need
For you,
The more I bless, the more I bleed
For you."The Outlaw Torn-Metallica

String Manipulation Problem

Sidney3-Jun-02 5:28

Sidney

3-Jun-02 5:28

Hi everyone,

I know this will not be a tough one for you guys... I'm doing a Win32 Application I was trying to extract a string on a string but String.H is limitted I need more advance parsing like MID Function, I cant use CString.H since my project is notMFC, is there another way around that I can extract a string from a string by specifying the offsets and the length? I tried to use this code:

lpAlpha1 = DynamicData; //Just showing to you that I search a dynamic string....

StartPos = 0;
EndPos = 0;
strLen = strlen(lpAlpha1);
while (StartPos < strLen){
EndPos = strcspn(lpAlpha1," "); //Problem
for(i=StartPos,j=0;i<=EndPos;i++,i,j++){
searchStr[j] = lpAlpha1[i];
}
searchStr[j]='\0';
....Search the searchstring in the database..
StartPos = EndPos;
}
cout << searchStr;

But this code post a problem on the strcspn function since I can's specify which offset should it start looking for the space to get the next word on the string.

I hope you understand my explanation, Please help me on this one.

Thanks/Regards
Sidney

Thanks/Regards
Sidney

Re: String Manipulation Problem

Joaquín M López Muñoz3-Jun-02 6:33

Joaquín M López Muñoz

3-Jun-02 6:33

If you decide to switch to std::strings (which I highly recommend), then substr works like a charm for extracting substrings much like MID$ in BASIC does.

Joaquín M López Muñoz
Telefónica, Investigación y Desarrollo

Re: String Manipulation Problem

Sidney3-Jun-02 7:30

Sidney

3-Jun-02 7:30

Hi Joaquin,

ummm... I can't quite understand the use of this, do you have a very sample code that can shoe on how to use this? Please if you have kindy send me a copy, I do not know how to use this.

Thanks/Regards
Sidney

Re: String Manipulation Problem

Joaquín M López Muñoz3-Jun-02 7:57

Joaquín M López Muñoz

3-Jun-02 7:57

Sure:

std::string str1="Hello miserable world";
std::str2=str1.substr(6,9); // =="miserable"

Joaquín M López Muñoz
Telefónica, Investigación y Desarrollo

Re: String Manipulation Problem

Bill Wilson3-Jun-02 6:33

Bill Wilson

3-Jun-02 6:33

string::SubStr does the same thing as CString::Mid

Consult MSDN for more info.

Re: String Manipulation Problem

Alexandru Savescu3-Jun-02 9:15

Alexandru Savescu

3-Jun-02 9:15

You can use that CRT strstr function (you can a pointer to the string tu substact and then you do a strncpy to copy into another string the string found. Anyway I would recommand std::string better.

Best regards,
Alexandru Savescu

Re: String Manipulation Problem

Michael Dunn3-Jun-02 18:39

Michael Dunn

3-Jun-02 18:39

If you already know MFC's CString, then just use WTL which has its own CString. Smile | :)

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Load from resource instead from a file?

3-Jun-02 5:25

Hi,
I have a function that loads a file from harddisk. I'd like to add a second function that loads the file from the resource. How do I get a pointer to the data and the size of it?

<br />
BOOL LoadTGA(char* filename, char** ptr);<br />
BOOL LoadTGA(UINT nIDResource, char** ptr); //new <- ???<br />

thx, Moak

Re: Load from resource instead from a file?

C^hris L^osinger3-Jun-02 5:24

C^hris L^osinger

3-Jun-02 5:24

// if you want to load from an external DLL:
// (be sure to call FreeLibrary when you're done)
HINSTANCE hInstance = LoadLibrary(pDLLPath);

// or, if you're loading this resource from the current application:
HINSTANCE hInstance = AfxGetInstanceHandle();

HRSRC hRsrc;

// pResourceName is either the numeric ID of your resource (ie. ID_MY_JPEG) 
// or the string name (ie. "MYJPG")

// pResourceType is the custom resource type you've chosen for this resource.
// you assign this when you "import" the data into your EXE/DLL

// find it
if (hRsrc = FindResource(hInstance, pResourceName, pResourceType))
{
    // load it
    HGLOBAL hGlobal = LoadResource(hInstance, hRsrc);

    if (hGlobal)
    {
        // lock it
        BYTE *pImage = (BYTE *)LockResource(hGlobal);
        
        DWORD dwSize = SizeofResource(hInstance, hRsrc);

        .... whatever

        // clean up
        UnlockResource(hGlobal);
        FreeResource(hGlobal);
    }
}

_(src)
-c

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Re: Thx

3-Jun-02 5:45

looks easy now Smile | :)

How do i use the IShellFolder->ParseDisplayName correctly?

redeemer3-Jun-02 5:26

redeemer

3-Jun-02 5:26

I always get an error when doing this procedure "The parameter is invalid.", here's how i call it. (pIdl is an ITEMIDLIST retrieved by calling SHBrowseForFolder, ghWnd is the handle to my window, and pNewId is modified by the EnumIDList->Next procedure)

IShellFolder *pBrowse = NULL;
IShellFolder *CurrentFolder = NULL;
ITEMIDLIST *pNewId;
char szFolderPath[MAX_PATH+1];
char szCompletePath[MAX_PATH+1];
WCHAR szTemp[MAX_PATH+1];
STRRET strDispName;


SHGetDesktopFolder (&CurrentFolder);
CurrentFolder->BindToObject(pIdl, NULL, IID_IShellFolder, (LPVOID*)&pBrowse);


SHGetPathFromIDList(pIdl, szFolderPath);


pBrowse->GetDisplayNameOf(pNewId, SHGDN_INFOLDER, &strDispName);
PathCombine(szCompletePath, szFolderPath, strDispName.cStr)
MultiByteToWideChar (CP_ACP, 0, szCompletePath, -1, szTemp, sizeof (szTemp) / sizeof (WCHAR));
pBrowse->ParseDisplayName(ghWnd, NULL, szTemp, NULL, &pNewId, NULL);

Thanks all!

Prime numbers...

Matt Gullett3-Jun-02 5:05

Matt Gullett

3-Jun-02 5:05

I know many of you probably already have a function that does this, so I'll ask before I do a lot of searching.

I need a simple C function for generating the next prime number given an input number. The prototype for this would be something like:

int GetNextPrime(const int iAfter);

If iAfter is 90, then GetNextPrime would return 101.

I need this to optimize some code I am working on which must initialize the size of an MFC CMap hash table.

Re: Prime numbers...

Rama Krishna Vavilala3-Jun-02 5:14

Rama Krishna Vavilala

3-Jun-02 5:14

How is this different from lots of class assignment questions posted in the list? Smile | :)

Re: Prime numbers...

Matt Gullett3-Jun-02 5:17

Matt Gullett

3-Jun-02 5:17

Hello. I can see how this might be viewed as a class assignment since I know that this type of thing is found in CS courses.

Unfortunantely for me, I am not a student and have never taken any CS courses. I'm sure with some searching on google I can find this kind of thing, but since it is a low priority right now, I thought I would post on CP. It is something I need (eventually) to do with some of my code where I populate CMap objects with varying amounts of data.

Sorry for the confusion.

Re: Prime numbers...

Rama Krishna Vavilala3-Jun-02 5:23

Rama Krishna Vavilala

3-Jun-02 5:23

I was just kidding. Long time back GiLes posted some code in The Lounge that calculated prime numbers. You may look under his profile. Right now my Internet is running slow so I can't help you. CP Who's who search for Giles and look his messages you will be able to find. Smile | :)

Re: Prime numbers...

Matt Gullett3-Jun-02 5:36

Matt Gullett

3-Jun-02 5:36

Thanks for the info. I went ahead and searched google and found one just to avoid any confusion.

One question, though. I knew you could just run through all the numbers and try and divide it by every number less than it, but I was kinda hoping there was some kind of math trick to make it faster or something.

I guess my original question should have been: Is there a better way to calculate prime numbers than just checking each number by dividing it by every number less than it?

Re: Prime numbers...

Tomasz Sowinski3-Jun-02 6:15

Tomasz Sowinski

3-Jun-02 6:15

Matt Gullett wrote:
knew you could just run through all the numbers and try and divide it by every number less than it, but I was kinda hoping there was some kind of math trick to make it faster or something

Of course there is. You need to check numbers up to square root of tested one.

Tomasz Sowinski -- http://www.shooltz.com

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